Headrest apparatus



March 16 1926.

F. KOENIGKRAMER HEADREST APPARATUS 2 Sheets-Shee-t l Filed March 5, 1923 akten-1mg 2 Sheets-Sheet 2 l gin/Wmo@ HEADREST APPARATUS Filed March :3, 1925 March 16 1926.

CAD

Patented Mar.' it, 1325..

FRANK KOENG-KRAMER, OF CINCINNATI, OHIO.

HEADREST APEAPUATUS.

Application inea March s, ieee.l

7 1o all 'w 710m t may concern Bc it known that I, FRANK KonNioiinAM- nn, a citizen of the United States, residing at Cincinnati, in the county ot Hamilton and State ot Chio, have invented certain new and useful Improvements in Headrest Apparatus, olf which the following is a specification.

My invention relates to improvements iii head-rest adapted to be applied to surgical chairs, Optometrists chairs, barber chairs, etc. One of its objects is to provide an iinproved means of adjustment. Another object is to provide an improved means of universal adjustment. Another object is to provide an improved means oit adjustment operable from its rear end with one hand while its clamping` and releasing means is operable by the other hand of the operator.v

My invention also comprises certain details of form, and combination ot components, all of which will be fully set forth inl the description ot the accompanying drawings in which:

Fig. 1, is a side elevation oit a head rest and a portion of the back ot a chair to which it is shown attached embodying my invention.

Fig. 2, is a perspective view ot one ot the head-rest adjusting and clamping members detached.

Fig. 3, is a similar viewof another adjusting and clamping member.

Fig. 4,is a perspective view of the clamping hand-wheel detached.

Fig. 5, is a perspective view of a tensioning spring detached.

Fig. 6, is an enlarged sectional detail taken on line 6 6 of Fig. 1.

Fig. 7, is a plan of the head-rest pads and their immediate supporting members. j

Fig. 8, is a plan of the means toiadjust ably attaching the head rest to a chair back.

Fig. 9, is a sectional detail taken on line 9 9 of Fig. 8.

Fig. 1() is a view similar to Fi g. 8 with the cap plate detached.

Fig. 11, is similar to Fig.-G, illustratinga modification.

The accompanying drawings illustrate the preferred embodimentet my invention in which 16 and 17 represent two oppositely mounted head-rest pads supported upon a forked member 18 to the center o1C which `is rigidly attached a rearwardly projecting bolster 19. The bolster 19 is vertically slotm Serial No. 622,654.

ted to receive one end ot each o1 two substantially parallel bars 2O and 21 which are pivotally attached to the bolster 19 respectively, by means ot pivot bolts 22 and 23. [it their opposite ends the bars 2O and 21 are respectively pivotally connected to an adjusting lever 24 by means o'l pivot bolts 25 and 2G.

rlihe bar 2O is mount-ed to slide endwise in a guideway formed by the pin 27 on one side ot bar 2O and the pins 28 and 29 on its opposite side. The pins or stud shafts 27, 28, and 29 are all mounted upon and pioject from one face of a clutch or clamping member 30. r)The member 30 is loosely and rotatably mounted upon a bolt. or stud 31 projecting from the center of a conical recess 32 in the head 22 of the shank 34. In order to provide a longer guide or bearing for the member 30 upon the bolt 31, I preferably provide a tubular projection or sleeve 37, slightly shorter than the pins27, 28 and 29, projecting from the saine face of member 30. rlhe 4periphery of member 30 is slightly tapered to engage the tapered annular wall ot the recess 32 and form therewith a tapered friction clutch, which serves to releasably clutch the member 30 to the head 33 whenever the hand wheel 35, which is threaded upon the outer end of the bolt 31, is tightened up upon the collar or washer 36 to thereby clamp the two bars 20 and 21 between the collar 36 and the member 30. The length of the pins 27, 28 and 29 and the tubular projection 37 are less than the thickness of the bars 2O and 21 to avoid contact between the collar 36 and the end of said pins 27, 28 and 29 and the projection 37. rhe face of member 30 is slightly advanced beyond the annular rim or face 38 of the head 33. Y l

rll'ie shank 34 is' preferably polygonal in cross section to prevent it from rotating relative to the chair back upon which ity is mounted. A clamping frame or plate 40 is rigidly attached to the rear face of the chair back 41, and is provided with an open veitieal groove or guideway 42 to receive the shank 34, and in which the shank 34 is adjustable endwise.' The recess or guideway 42 is of greater width than the shank 34 thereby providing room at one side ofthe shank 34 to receive a substantially flat or leaf-spring 44 to bear withv a yielding4 tricticnal tension.

upon one tace et the shank 34. The spring 44 is preferably 'somewhat wider than the shanl 34 and a corresponding recess or pocket 45, is termed in the trame 40' to retain the spring against displacement endwise of the iframe 40. A detachable ca'p or plate 4r-G is secured rigidly and eetachably to the trame l0 by means et cap screws 47. A thumb screw 48 is threaded centrally through the plate 46 so that its inner end may bear against the central portion of the spring' 44. to tl'iereby variably adjust the tension of the spring,` ii-4i upon the face of the shank S4. Ordinarily thethumb screw Lll8is in an idle position and the spring leiby reason of its engagement near its ends upon' the shank Sil, and near its center upon the inner tace of the plate it exerts sutiicient resilient tension upon the shank Bil to permit the shank 3i to be readily adjusted by hand up and down to any desired position with reference to the chair-back, for instance high enough for the pads 16 andl to support the head et a tall person, and low enough for the pads to support the head of a child yor short person, and to retain any position to which said shank may be adjusted relative to the chair back.

Then it is desired to secure a moreirm or rigid locking ot the shank 34 to the chairbaclr, the humb screw 4S may be partially or firmly screwed home upon the spring' 44 to thereby secure any desired degree o't tension by the spring; lll upon the shank gli, up to the point where the shank is immovably locked to the chairebaclr, as is at times required where minor operations vare to be perforn'ied with a patient seated in the chair. I prete*ablyprovide a small handle il-9' at the lower end of the shank 'to assist in adjusting the shank endwise through the' frame 40. In operation the adjusting' lever 9.4 may be conveniently grasped between the thumb and finger of one hand say the left hand, While theother hand say the right hand holds the hand wheel t 5. The hand wheel 35 may serve as a handle or means to adjust the shankl 34. vertically lin either direction and also at the same time or alternately to loosen or tighten the hand wheel upon the bolt 3l. lhenthle hand wheel d5 ris loosened upon the bolt 3l the other hand may be employed to advance or retract the head rest by sliding the bar 20' along its guideway over the face ot member 30, and between members 3() and 36. The same act of loosening the hand wheel also releases the member SO where it is clutched by thetapered clutch face-sto the head 33 of the shank 34, thereby enabling' the operator through the actuating' lever L4 to rotate the member 3() in its recess 32 relative to head member 33 to thereby change the angle of the bars 20 in Fig. l, to thereby' cl'iauge the relation of the bars 2O and 21, and to either upwardly or downwardly incline the head-rest pads '1G and 17 as indicated in dotted line in Figui.

rlh'e operator is thus enabled to carry out three distinct types of adjustment ot the lieadrest pads through torce applied by one hand only to the actuating lever 24. Also tht operator is enabled to sin'n'iltaneoi-isly carry out all three of these separate adjust;- ments or any two thereo'h and in varyingl degrees by force applied by one hand through the actuating` lever 24. At the same time the actuating lever 24 and the hand oi the operator is at some distance in rear ot the head ot' the patient and not liable to become entangied in the p'aticnts hair, whilel the sense of touch may be' employed to secure a Ffm but mild application' oi' the head-rest pads to the patien'ts head. At the same ti. .c that the actuating' lel'cr 2i is beingv actuated by one hand of the operator, the hand wheel may be employed to adjust the head rest shank vertically relative to the chair bach and also at the same' time or almost at the same instant to either' release or tighten the hand wheel35 to 'thereby rigidly clan-1p the bars 2O and E121 to the member 8O and the member 30' to the' shank In Fig. ll I have illustrated a modification in which G0 represents the shank, G?) the head thereof, G2 a disk shaped clamping member corr'esp'onding` to the i'i'ien'iber SO ot (i, which is` clainpedagains't the plane annular face of the head Gi). Member 62 is provided with three pins or studs ot which Ytwo 65 and 66 are shown in Fig. 1l, and which pins form an guidex'vay for the endwise adjustment of the. rod G7, corresponding to the rod '20 ofFig. 6. A disk shaped clamping men'iber corresponding to member 36 or' Fig. G, is clai'npc-d by the hand wheelGQ upon the substantially oarallel rods 67 and 70' to lock said rods ilu'- idly in place between the collars "D and (i8.

0.o The hand wheel at the same time locks the collars 62 and 68 rigidly to the. shauhV head 63, ai projection 72 from the shank (S0 enters a hey slot 73 in the perijihery oit the collar 68 to' prevent rotation ot said collar which rotation might result in accideutaliy, under strain7 loosening the hand wheel (SS) upon the threaded shank 74 upon which it is threaded.

The range or adjustn'ici'it is unusually Wide for the size oit the apparatus employed, and the adjustments are capable of being made at a ldistance from the head ot' the patient7 which is desira'l'ile and of importance and adjustments may be made and rcmade with accuracy 'and dispatch, and With more delicate sense of touch then hereto- :tore attainable. I

The apparatus herein shown and desi-,libed is capable of considerable modification without departing from the spirit ot my invention.

that I claim is:

l.. A head-rest apparatus comprising a shank provided with a clamping bolt at its upper end, a clamping member pivotally mounted upon said clamping bolt and adapted to be releasably clamped thereon to said shank, a. pair of substantially parallel bars spaced apart and located respectively upon opposite sides oit said clamping bolt and in sliding engagement with the face of said clamping member', one of said bars being adjustable endwise in guides carried by said clamping member, an actuating lever pivotally attached to both ot said bars at one end thereot, a head-rest pivotally attached to both of said bars at their opposite end, and means serving to clamp both of said bars to said clamping member and at the saine operation to clamp said clamping member to said shank.

2. A head-rest appa atus comprising a shank provided with a clamping bolt at its upper end, a pair of substantially parallel bars spaced apart and relatively movable to anditrom each other with said clamping bolt interposed between said pa allel bars, said parallel bars being adjustable rotatably and endwise relative to said clamping bolt, a head-rest pivo-tally attached to both or" said bars at one end thereof, means to pivotally connect said bars together at their opposite end, and means carried by said clamping bolt to releasably rigidly clamp said bars to said shank in relatively dilierent positions of adjustment.

3. A head-rest apparatus comprising a shank provided with a clamping bolt, a first clamping member mounted rotatably upon said clamping bolt and adapted to be releasably clamped thereon rigidly to said shank, a pair of substantially parallel bars spaced apart and located respectively upon opposite sides ot said clamping bolt and in sliding relation with the tace ot said clamping member, one ot said bars being adjustable endwise in guides carried by said clamping member, a head-rest pivotally attached to both of said bars at one end thereot, an actuating lever pivotally attached to both of said bars at the opposite end thereot, a second clamping member mounted upon said clamping bolt in contact with the opposite face of said bars, and a clamping nut threaded to the free end of said clamping bolt and adapted to rigidly clamp said iii-st clamping member said parallel bars and said second clamping member together upon said clamping bolt and between said clamping nut and said shank.

4. A head-rest apparatus comprising` a shank provided with a clamping bolt', a irst clamping member mounted rotatably upon said clamping bolt and adapted to be releasably clamped thereon rigidly' to said shank, a pair ot'substantially parallel bars spaced apart and located respectivelyv upon opposite sides of said clamping bolt and in sliding relation with the face oli said clamping member, one ot said bars being adjustable endwise in guides carried by said clamping member, a head-rest pivotally attached to both of said bars at one end thereoil, an actuating lever pivotally attached to both oit' said bars at the opposite end lthereoit, a second clamping member mounted nonrotatably relative. to said shank upon said clamping bolt in engagement with the opposite tace ot' said bars, and a clamping nut threaded to the free end ot said clamping boltand adapted to rigidly clamp said first clamping member, said parallel bars and said second clamping member together upon said clamping bolt and between said clamping nut and said shank.

5. A head-rest apparatus comprising` a shank, a first clamping member rotatably mounted upon said shank and adapted to be clamped rigidly to said shank, said clamping member bei'ng provided with guidevvays, a pair of substantially parallel bars spaced apart and movable to and Jfrom each other, and adjustable endwise and rotatably with said irst clamping member upon and relative to said shank, a second clamping member non-rotatably mounted relative to said shank and upon the opposite tace of said bars from said first` clamping member, and a member adjustable to clamp said rst and second clamping members upon said shank.

in testimony whereof I have ailiXed my signature.

FRANK Kennis-KRAMER. 

